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Option 4 : 69 kg
Given:
The average weight of 3 persons A, B, and C is 60 kg.
When D joins the group, the average weight becomes 65 kg.
E whose weight is 3 kg less than that of D replaces A, the average weight of B, C, D, and E becomes 67 kg.
Concept used:
Total = Average × Number of entities
Calculation:
So, the weight of D = (65 × 4) - (60 × 3) = 80kg
Then, the weight of E = 80 - 3 = 77kg
According to the question,
77 + (60 × 3 - P) + 80 = 67 × 4
⇒ P = 69
∴ The weight of A is 69kg.
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